Rice, lentils, peas, beans, wheat berries, barley, oats, etc. But if you buy in large bulk (which you should do for the cost savings), you should repack the goods into smaller individually sealed containers. Because a 25kg bag of rice, once opened, will take a small family all year to get through, and having an open bag of rice attracts rodents, weevils, moisture, mould and dust. Pack it down into half kilo or 1kg containers, ideally vacuum sealed or with some other preventative treatment. Then only open 1 container at a time.